V6 3.1 1992 Firebird not running. - Third Generation Pontiac Firebird (1982 - 1992) - Firebird Nation

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V6 3.1 1992 Firebird not running.


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7 replies to this topic

#1 ChrisM

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  • Year: 1992
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  • Model: Firebird
  • Engine: 3.1 v6
  • Transmission: Auto

Posted A week ago

Hello, my name is Chris and I'm from the Netherlands. I need some help.
My Firebird V6 from 1992 wil not start.
It has no malfunction codes, it has spark, fuelpump runs, but it wil not run.
It also does not start on brakecleaner.

I already put in new sparplugs, new ignition wires, new rotor, new ignition cap, new ignition module, new IAC valve, new TPS sensor, new Map sensor, new Fuel pump, new ignition coil, new battery.
Stil not running.

There is an aftermarket alarm in the car could this be the problem, or is there an other thing I should check.

Thank you for reading.

#2 Injuneer

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Posted A week ago

Are you aware the vehicle has a Vehicle Anti-Theft (VATS) system?  Do you have an Owners Manual showing operation of the system?

 

Have you scanned the ECM (computer) for trouble codes?

 

Have you checked the fuel pressure?


1994 FIREBIRD FORMULA
FRED

 
381ci all-forged stroker (Callies Stealth, Oliver billet rods, BME 2618-T61 nitrous pistons) - 10.8:1 - CNC LT4 heads/intake - Comp Cams solid roller - MoTeC M48 Pro engine management - 8 LS1 coils - 58mm TB - 74#/HR injectors - 300-shot dry nitrous - TH400 - Gear Vendors 0.78:1 O/D - Strange 12-bolt - 4.11 Pro-Street gears - AS&M headers - true duals - Corbeau seat - AutoMeter gauges - roll bar - Spohn suspension - QA1 shocks - a few other odds 'n ends. 800HP / 800lb-ft at the flywheel, on a 300-shot. 11.5 @ 117 MPH straight motor
 
https://www.firebird...9_698_32777.jpg

 


#3 ChrisM

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  • Year: 1992
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  • Model: Firebird
  • Engine: 3.1 v6
  • Transmission: Auto

Posted A week ago

Thank you for replying.
I checked for codes, but there are non.

I checked for fuel by using the ceck valve on the intake manifold. At the rear of the itake.

It could be the VAT systhem. How can I check this.

#4 sea dog

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Posted A week ago

Does your security light come on when you turn key on? Then go out after several seconds? This is normal procedure for security system. If security light stays on engine won't run because fuel injectors will not open & spray fuel. Good vats write up at  http://www.shbox.com

 

However, since you sprayed flammable liquid into intake & engine wouldn't run, I suspect an ignition problem.



#5 Injuneer

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Posted A week ago

Unanswered questions:

 

Do you have an Owners Manual showing operation of the (VATS) system? (These may be available online as digital files, from GM)

 

Have you checked the fuel pressure? (or did you just depress the Schrader valve on the test port to see if fuel came out?)



#6 ChrisM

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  • Model: Firebird
  • Engine: 3.1 v6
  • Transmission: Auto

Posted 4 days ago

I checked the ignition, its okay.
Everything has been replaced with new parts.
Securety light goes out while starting.
When I clean all the sparplugs it wants to start, it runs and then stops.
When I look at the sparkplugs after that they are wet.
Could it be getting to much fuel.
I have spark, fuel, compression, but not running....
Pfffff what can it be.

#7 Injuneer

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  • Model: Firebird Formula
  • Engine: 381ci LT1 stroker
  • Transmission: TH400 + GV O/D

Posted 4 days ago

When I clean all the sparplugs it wants to start, it runs and then stops.

 

When I look at the sparkplugs after that they are wet.

 

Could it be getting to much fuel.

 

 

If the spark plugs are soaked with wet fuel, to the extent that they can't fire, there has to be a problem with too much fuel.  Are all the plugs wet, or just a few?

 

Could be a problem with excessive fuel pressure, or the injectors being stuck open.  But you apparently don't want to tell me about an actual fuel pressure test.  With pressure gauge in place, turn the key to "run" (not to "start") and watch how the fuel pump primes the system.  What is the pressure when the fuel pump shuts off?  How fast does fuel pressure drop (which may indicate leaking injectors).  When the engine does start (after cleaning the plugs), what is the fuel pressure?

 

There is also a possibility the plugs are not firing and no fuel is being burned.  You indicate "I checked the ignition, its okay.".  Have you pulled a plug wire, held it near a ground and actually observed the presence of a spark while the starter is cranking the engine?

 

 

Another possibility - Could also be the coolant temp sensor indicating a very low coolant temperature.  The ECM enriches the A/F ratio on cold start.  If the coolant temp sensor is indicating an unrealistically low temperature, it could be flooding the engine.  You would need an OBD-1 scanner with the ability to read real-time ECM data to check this possibility.



#8 ChrisM

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  • Engine: 3.1 v6
  • Transmission: Auto

Posted 4 days ago

Thank you for replying.
I will start checking everythinh you wrote down.




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